Simulação da influência do excesso de carga e da temperatura na deformação permanente em revestimentos asfálticos

Abstract

Rutting on asphalt pavements is a common distress in national highways, turning it into a major concern due to its early occurrence, often within the first weeks or months after traffic release. Among the reasons of rutting, one might mention the overload of heavy truck traffic. Such overload, besides damaging the pavement and consequently decreasing its life span, is responsible to decrease the overall safety of the mechanical integrity in vehicles (i.e. brakes, axis, bearing, truck or engine). Unfortunately, overload has been a common practice not mitigated by law enforcement. The characterization of a hot mixture asphalt with respect to rutting resistance does count with a national standard. However, there is room for improvement to evaluate rutting when overload occurs. This study aims to evaluate the effects of traffic overload on rutting of hot mixture asphalts by means of the uniaxial repeated load test under different levels of loads. Moreover, it is incorporated into the experiments and computational analysis the effects of temperature considering different environmental conditions. It was found a low correlation between the different loads at the uniaxial repeated load test and the FN. This parameter was found sensible to the temperature variation, presenting good levels of correlation. The tests and computational analysis provided a better understating about the load and temperature effects on asphalt rutting.